Sheriff’s spokesman Officer Christopher Hegstrom says Orduno was being housed in the county jail’s psychiatric unit and was discovered missing just before 9 a.m.

Authorities originally thought Orduno might have been hiding somewhere at the sprawling south Phoenix jail, which also houses Arpaio’s famous “tent city” lockup. But jail personnel searched the 600,000-square-foot complex and determined he wasn’t here.

Arpaio says Orduno now faces additional charges related to the escape. Arpaio says an investigation into how he got out is under way.